Grinding-machine for scarfing or beveling saws



(No Model.)

J. N. QUINN. v GRINDING MACHINE POR SGARFING 0R BEVELING SAWS.

No. 489.984. Patented Jan. 17, 189s.

Wrnesses- Invenur'.

NrTnD STATES PATENT Ormes.

JOHN N. QUINN, OF CINCINNATI, OHIO.

GRlNDING-VIACHINE FOR SCARFING OR BEVELING SAWS.

SPECIFICATION forming part of Letters Patent No. 489,984, dated January17, 1893. Application led September 2,1892. Serial No. 444,867. (Nomodel.)

To all whom it may concern.-

Be it known that I, JOHN N. QUINN, a citizen of the United States, and aresident of Cincinnati, in the county of Hamilton and State of Ohio,have invented certain new and useful Improvements in Grinding-Machinesfor Scarting or Beveling Saws, of which the following is a specication.

My invention relates to machines for scarfing the meeting ends of bandsaws, dressing shingle saws, and for similar purposes.

Its objects are to lessen the labor of grinding the lap joints andbeveled surfaces generally, to insure uniform work, and prevent theuneven wear of the grinding wheel. These objects I attain by the meansillustrated in the accompanying drawings, in connection with which theinvention will be first fully described, and then particularly referredto and pointed out in the claims.

Referring to the drawings, in which like parts are indicated by similarreference letters wherever they occur throughout the various views:Figure 1 is a perspective view of the machine embodying rnyimprovements.Fig. 2 is a plan view of the same. Fig. 3 is a detail View in centralvertical section through the upper front rail of the frame, the inclinedbed plate and its supports.

The frame of the machine may be of any approved construction. In thepresent case it consists of four uprights A, braced together bycross-rails A, and parallel top-rails A2. The inner edges of thetop-rails A2 are provided with tl-shaped guides which entercorresponding depressions, ZJ, in the side rails of the sliding frame B.Upon this sliding frame are secured bearings, b for the sliding shaft ormandrel, c, which carries the grinding wheel C, and the pulley, c', bywhich the mandrel is driven, and also bearings, d, for the shaft, d',upon which are secured the beltdrum D and the belt-pulley, cl2. Theshaft, cl', is driven by a belt passing over a pulley, c, and thepulley, cl2. The pulley, e, is secured upon a shaft, e', which shaft isdriven by a belt from any suitable source of power passing over thepulley E, which is also secured upon the shaft, e. The frame B isreciprocated in its guides by a lever F, which is actuI ated by a crankwheel, f, through connecting bars, f', f2, and a lever bar, f3. Thecrank lever, f3.

wheel, f, is secured upon a shaft F', which shaft is driven bya belt,f4, which passes over a pulley, f5, secured upon the shaft F and. apulley, e2, secured upon the driving shaft, e. The stroke of the slidingframe Bis regulated by shifting the connecting rods,f,f2, nearer to orfarther from the fulcrum of the A series of holes is bored in each endof the lever for lthis purpose.

Gis an inclined board or bed-plate, upon which the article to be dressedis secured. Its front end rests upon two wedge shaped blocks, H, H',which are held loosely between blocks, h, which are secured uponopposite sides of the cross -brace A', upon which the lower block, Il',rests. The lower block, H', is adjustable along the crosssbrace A', bymeans of a screw-shaft tapped through a nutin one of the uprights A'.The inner end of this shaft is connected by a swivel joint to a platesecured in the end of the wedge block, H', and the outer end is providedwith a handwheel, 7L', by which the screw shaft is turned and the lowerblock is moved to lower or elevate the front end of the bed-plate Gr. Tosecure proper cross-alignment of the bed-plate G two set screws, h2, areprovided, which pass through the cross-brace A', and bear against theunder side of the sliding block H'. The rear end of the bed-plate G isvertically adjustable by means of a set screw, g, which is tappedthrough the rear cross-brace A', and bears upon the under side of thebed-plate G. The purpose of the adjustable wedge-blocks, H, I-I, is toset the machine for grinding blades of different thicknesses. Thepurpose of the set-screws, h2, is to align the bed to adapt it to grinda true lap, even though the plate be inclined from one edge to theother. And the purpose of the screw, g, for elevating the rear of thebed-plate Gr, is to adapt the machine to grind -bevels of differentangles.

The mandrel, c, which carries the grinding wheel C, is iitted to slidein its bearings, and is actuated in its sliding movement byahand leverJ, the rear end of which is slotted to traverse a fulcrum pin, j,secured upon the longitudinal side rail B. It is, near its forward end,provided with a strap which fits into a grooved collar, c2, and at itsforward end with a handle, j', by which the operator slides the shaft,c, and carries the grinding roo' wheel C back and forth across the edgeof the blade until the proper lap or bevel is formed. The grinding Wheelshaft being mounted in bearings upon each side of the grinding Wheel,and Working against the edge of the lap, or longitudinally of the bladeif a band saw is being ground, insures a steady motion of the Wheel, andan even Wear upon its face, which it is impossible to attain in anoverhanging Wheel. I find by experience that a more perfect joint canthus be produced in less time than it is possible to make an inferiorjoint With an overlapping Wheel Workin g across the edge of the blade.

For beveling the edges of shingle saws the bed-plate G has a centrallongitudinal slot, as shown at, g', Fig. 2, to receive a bolt Whichpasses through the eye of the saw, and has a nut on top to secure thesaw on the bed` plate. There is little need to change theconnecting-rods, f, f2, for grinding the laps of band-saws; but Where alonger bevel is required, as upon shingle saws, it is necessary toimpart a longer stroke to the sliding frame B; and this is accomplishedby bringing the upper connecting-rod, f2, nearer to, and the lower one,f', farther away from the fulcrum of the lever, f3. The end of theconnectingrod, f', Which is connected to the crank Wheel,

3o f, may also be provided with a seriesof holes the grinding Wheelshaft mounted to slide in bearings secured upon the sliding frame, the

grinding Wheel secured upon said shaft between the bearings, theinclined bed-plate for holding the work to be beveled, arrangedunderneath the sliding frame a hand lever to reciprocate the grindingshaft in its bearings, and means, such as shown, to automaticallyreciprocate the sliding frame, substantially as shown and described.

2. The combination of the frame having upper guide rails A2, the slidingframe carrying the grinding Wheel fitted to slide in said rails, theshaft bearings secured upon said frame, the grinding Wheel shaft fittedto slide in said bearings, the grinding Wheel secured upon said shaftbetween said bearings, the inclined bed-plate G arranged under thegrinding wheel and parallel With the sides of the sliding frame, thelever F, and means to rock it connected to the driving mechanism toautomatically reciprocate thev frame, and the hand lever J, fulcrumedyon the frame and connected to the grinding Wheel shaft, for the purposeof sliding the shaft in its bearings and carrying the grinding Wheelback and forth across the edge to be dressed, substantially as hereinbefore set forth.

3. In a lap grinding and scarfing machine of the character described thecombination, substantially as hereinbefore set forth, of the main frame,the sliding frame carrying the grinding Wheel shaft mounted to slide inbearings secured thereon, the lever J to reciprocate said shaft in itsbearings, the lever F fulcrumed upon the main frame and connected to thesliding frame, the lever, f3, the crank whee1,f, and the connectingrods, f', f2, to automatically reciprocate the sliding frame, and theinclined bed-plate G, vertically and angularly adj ustable,forthepurpose set forth.

JOHN N. QUINN. Witnesses:

RALPH C. ENYART, GEO. J. MURRAY.

